// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
#define UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/views/controls/button/image_button.h"

namespace message_center {

// PaddedButtons are ImageButtons whose image can be padded within the button.
// This allows the creation of buttons like the notification close and expand
// buttons whose clickable areas extends beyond their image areas
// (<http://crbug.com/168822>) without the need to create and maintain
// corresponding resource images with alpha padding. In the future, this class
// will also allow for buttons whose touch areas extend beyond their clickable
// area (<http://crbug.com/168856>).
class PaddedButton : public views::ImageButton {
public:
    PaddedButton(views::ButtonListener* listener);
    ~PaddedButton() override;

    // Overridden from views::ImageButton:
    gfx::Size GetPreferredSize() const override;
    void OnPaint(gfx::Canvas* canvas) override;
    void OnFocus() override;

    // The SetPadding() method also sets the button's image alignment (positive
    // values yield left/top alignments, negative values yield right/bottom ones,
    // and zero values center/middle ones). ImageButton::SetImageAlignment() calls
    // will not affect PaddedButton image alignments.
    void SetPadding(int horizontal_padding, int vertical_padding);

    void SetNormalImage(int resource_id);
    void SetHoveredImage(int resource_id);
    void SetPressedImage(int resource_id);

protected:
    gfx::Point ComputePaddedImagePaintPosition(const gfx::ImageSkia& image);

private:
    gfx::Insets padding_;

    DISALLOW_COPY_AND_ASSIGN(PaddedButton);
};

} // namespace message_center

#endif // UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
